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Ensuring a smooth check-in for guests is always top-of-mind for Hosts. Find out how backup codes can help you and your guests avoid check-in delays.

What backup codes are

Backup codes are unique codes that are added to your smart lock and periodically updated, and they can be shared with a guest if Airbnb is unable to sync a code for the guest with your lock. Backup codes may be shared in the event that your lock is offline at the time of booking and a new code can’t be generated for the guest before check-in—this typically only happens with last-minute bookings. Backup codes may also be shared if your lock is offline when a trip change is made (ex: your guest extends their stay by a night), and their existing code won’t work for their entire stay.

These codes are added to your lock with no expiration, and each unique backup code is only shared with one guest. We’ll always let you know when a backup code is shared with your guest.

If a backup code is shared with your guest, we’ll update the code as soon as your lock is online so that it’s only active for the duration of their stay. Important: Backup codes are stored with no expiration. If you’re unable to get your lock online, you’ll need to manually remove the code after your guest checks out.

How backup codes are shared with guests

Backup codes are shared with guests in their email, Airbnb messages, and Airbnb trip guide, in the same way that other codes are shared. Guests won’t be able to tell that the code that they received is a backup code.

When backup codes won’t work

Backup codes can only be used on your smart lock if it’s powered on and usable. If a guest’s code can’t be synced with your smart lock, a backup code may be shared with your guest so they can access your place.

Important: If there’s a usability issue with your lock—such as dead batteries or a broken keypad—your guest won’t be able to access your place using the backup code on your smart lock. In these instances, your guest will be able to access your place using your backup entry method (if you've added one), or they'll need to reach out to you to access your place and resolve the issue with your lock.

How backup codes show in your smart lock app

Backup codes will appear in your smart lock app as “always active” or having no start or end date. How they’re named in your smart lock app depends on your lock manufacturer.

Backup codes in your Schlage smart lock app may start with “ab.”

How backup codes are different than a backup entry method

Backup codes can be shared with a guest to give them access to your place when your smart lock is offline but still usable. A backup entry method is an alternative way to access your place if your smart lock isn’t usable—for example, your smart lock batteries are dead or the keypad is broken.

A backup entry method (ex: Lockbox on the back door with a physical key inside, code is 1234) can be added to your listing and is only shared with confirmed guests when they’ve communicated to Airbnb during their stay that they’re unable to access your place. Find out more about how a backup entry method works.